/Engine/Source/Editor/UnrealEd/Classes/ThumbnailRendering/ThumbnailManager.h
Fixes up any classes that need to be loaded in the thumbnail types per-map type
void InitializeRenderTypeArray ( [TArray](API\Runtime\Core\Containers\TArray)< struct [FThumbnailRenderingInfo](API\Editor\UnrealEd\ThumbnailRendering\FThumbnailRenderingInfo) > & ThumbnailRendererTypes )